Android Auto is developed by Google LLC, and only they can release any fixes for issues arising from the software. You can submit feedback to Google regarding the app, this will be your best bet to get a fix in the future.

Same issue here. Dumb phone constantly disconnects from my 2017 Ford Focus. Also whenever I make a call, android auto crashes. I don't even like using the app anymore because it's such a pain. My old phone never did this. I really hate my this LG phone. I've done all the steps from article posted here along with a bunch of other recommended steps. I've set the phone to automatically start when Bluetooth is connected. "Optimized" android auto reset the thing.. There has not been a software update since I bough the phone in May. I hate this phone.